Carbureter.



C. F. JOHNSON.

CARBURETER. APPLICATION FILED SEPT. 29, 1913.

Patented May 5, 1914.

2 SHEETSSHEET 2.

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. and positioned substantially parallel to thel Aim UNITED sTATEsCHESTER F. JOHNSON, 0F DETROIT, MICHIGAN.

CARBUBETER.

' Specicaton of Letters Patent.

Patented May 5, 1914.

Application mea' sepemter ce, ma. smal No. 792,251.

Ta all 'whom it concern Be it known trat I, CHESTER F. JoHN- soN, acitizen of the United States, and a resident of Detroit, in the countyof Wayne and State of Michigan, have invented a new and ImprovedCarbureter, of which the ollowing is a specification. i i

This invention relates to means for controlling the current of airpassing through the c-nrbureters of internal combustion e ngines, andits object is to provide a novel valve to controlfthis current of air,and a simple and readily adjusted abutment for the spring .whichnormally holds the an' valve on its seat. l

This invention consists, in combination with the body of tliecarbureter,of a valve chamber adjacent thereto, a novel disk valve pivotallymounted in said valve chamber, an adjustable abutment, and a compressionspring engaging said abutment and the valve plane of the valve. n

In the accompanying' drawings, Figure 1 is a central section of thecarbureter. Fig. 2 is a transverse section through the throttle valve.Fig. 3 isl an elevation of theadjusting device for the throttle valve.Fig. 4 is a tsect-ion on the line -m of Fig. 1.` Fig. 5

is an elevation of the ioat chamber, 1iortions being broken away, toshow details of construction.

Similar reference characters refer to like parts throughout the severalviews.

This carbureter comprises a body constiuting a carbureting chamber, a'float cham. ber secured thereto, a valve chamber'connect ing to thebody, and a discharge passage extending from the body and in whichthethrottle valve is mounted.

The body l has connected to it an upwardly` extending cylindrical shell2 provided with a tubular lining 3, between which and thc shell 2 thecirculating water of the engine may pass through the openings 4 and toheat the explosive mixture. A shaft 6 extends through the shell 2 andthe lining 3, and carries the throttle valve 7. An arm 8 on one entioftheshaft is engaged by the spring 9, the other end of thespringpengaging the lug 10 on the shell 2. This spring normally holdsthe throttle valve in the position shown in Fig. 1. A second arm 12 maybe secured tb the other end of the shaft 6 so that thewthrpttle maybeopened by connecting means extending from a plurality of Stitions. Athird arm 13, carrying an vad'ustfable screw 14., is shown secured tothis s aft, the screw engaging a lug 15 on'the shell to determine thesize of the passage around the of its closing movement. 'A plug 16permits drainage of the space between the shell' 2 andlming 3.

body 1 is a downwardly inclined diaphragm 17, having adownwardly-taperinfr` strangletube 18'mounted in its center. The tube 18has perforations 19 to permit draining oi of the fuel which may condensein the body and accumulate on the diaphragm. A heating element 20,groundedat. one end on the tube diaphragm and. be energized by currentover the Wire 22.

The float-chamber consists .of a central casting, comprising the head23, having upwardly extending lugs 24C' contacting with the diaphragm,the feed connection 25 having a seat for the valve 26, the arm 27carrying a pivot 28 for the float 29, and the stem 30 having thepassages 32 and 33. A plug 3l screws into the bottom of the passage 32and holds the cup in position. phragm has a downwardly extending flange36 over the openings bet-Ween the lugs 24. A nozzle 37 may have alnedetermined bore to deliver the proper amount. of fuel oil.

An'extension 38 onv the head 23 carries a, 'sleeve 39 in which a stem 40is slidably mounted, beingnormally held up by the spring-41. A bracket43 on. the sleeve sup- 45 which may be 4swung, to depress the stem 40 tohold down the iioat and thus permit the level of the fuel oil to risehigher than the upper end of thc nozzle 37 and fill the depression inthe head23, thus insuring a very rich mixture. f

A valve chamber extends 1 and has a lower'opening or air inlet surheldin position by a ring 52 of mele/l. The ring 51 is the seat oi the valve53, which is preferablyA of aluminum so that it may be very light. Lugs54, extendingl down from the 'chamber 50, 'support the pivot b5 for thisvalve, which valve may be counterba'lauced by the weight 56. The up er oenthrottle valve when the valve is at the limit.

Across an opening in the bottom ofi-the.-

The dia-.

from thehiidyl rounded by a ring 51, preferably of leather,4

vai.

18, may be secured to the lower side of the ports a pivot 44 on which ismounted a lever l ing inthe valve chembermay be c osed y a 11o cap 57.A. dish 58, preferably of. leatlier,l may be. secured to this cap bymeans ot .fi rivet 59 and washer G0 and furnish a noiseless abutment forthe valve 53 and limit its upward movement.

Tivo platesl (3:2 on the upper side of the valve chamber carry the pivot6B for the controlling lever which has a'downwardly extending arm 64, aslotted arm and an inclined arm 66. This lever is normally in theposition shravn in F l, being thus held by means of a double spring 67that has a circular portion on each side of this lever, concentric withthe pivot 63, the two circular portions connected at the right of Itheartn G4, and the ends 68 of the spring engaging ine pin (39. As thecircular portions of the spring tend to open, the arm G4 of the leverwill he held toward the left., as in Fig. l. I A compression spring 70connects to the lower end of the arm til and to the lug 71 `on the valve53 and normally holds the valve on its seat. The relation oi' the 'partsis suoh'that the spring 7() will he substantially `parallel to the seatof the valve lVhen the engine is turned over and begins to draw air upthrough the earl'iureter, the valve 53 will be lifted, and, because ofthe springA 70 being mounted above the plane of the valve andond4 theopposite side o' the valve from its piaot, it will swing up on its outerend as a'pivot, so that the rate of compression ot thespring will beless1 than the rate of movem'eint of the valve. if the point oi"connection of the spring with the arm nl were moved near to the pivot55S, the compression of the spring would decrease still slower. untilthe point of support andthe pivot 55 coincided when there would be noeffective action of the spring.

Moving the point of support from the pivot 55 results in the compressionof the spring increasing much faster, the maxi mum being reached whenthe line oi the spring is at right angles to the line connect ing thepivot oi" the valve and the point ol vattachment. of the spring to thevalve. have found that the most effective action is obtained by soproportioning the parts that the pivot 55 is below substantially theiniddle of the length of the spring and the spring is substantiallyparallel to the 'face of the valve.

To increase the initial tension of the spring, a threaded projection 72on the valve chamber may be formed to receive the'screw 73, providedwitlra` ribbed knob 74 and a pointede'nd 75 adapted to engage theinclinedarin ,66, as, shown in Fig. l. By screwing in this pointythe.arms 6G and 64 will be swung toward the right, (in Fig. l) a'fnd 'thusinitially compress the spring 70.

small p in 7.7, having a collar 78 and pointed nd79',"may be mounted ona proper bore r body having an air in an extension 80, being held upwardhy mounted on Said the spring Sl so that the. point. 79 will cngagc thcknob Tl and prevent the screw l'roni turning alter it has been adjusted.

A flat plate Sil niniv be scoured over the space between the pla tes(352, as shown in Fig. l, by means of the screw S, and prevent theentrance of dust :ind dirti.

liv means of a connector attached to the aini G5, increased tension canbe put on the spring 70 and the (low of the air through the main inletmay be thereby retarded, thus reducing the air pressure in the body ofthe carbureter and causing :in increased flow of fuel from the nozzle3T. The normal tension on the spring can be regulated by turning thescrew 73, in or out, and thereby increasing or decreasing the tension ofthe spring 70.

I cliiiin.

1. In a carhurcter, the combination of a carbureting chamber, .s valvechamber connected thereto and having an air inlet in its lower side, aflat valve normally closing said opening and having a downwardly andoutwardly exteni'ling arm, a pivot for said arm and valve mounted on thevalve chamber below the plane of tlievalve, :1 lug on the upper side ofthe valve, and i. compression spring mounted above the plane of thevalve and substantially parallel thereto and in engagement with said lugto normally hold down the valve.

in a carburetor, the combination of a carlnircting elian'iher, :i valvechamber connecflril thereto and having an air inlet in its lower Isideand a valve-seat encirclin the opening, .fiv pivot support extending owntroni ihe body and a pivot. mounted therein, a valve normally elosingthe air inlet and having a downwardly extending arm mounted on the sideot' the valvma compression sprin nniinited above the plane ot' the valvewith one end in engagement with said lug', and inljustahhf i'neans` forsupporting the opposite end o1? the spring.

ln a, Corbin-eter. the combination-of a inlet and a valve-seatencir-"lineY ihe opening, a pi vot support extendingdi'iivn troni thebody at one: side of the opening. a valve normally closing theaii` inletand having an ai-ni extending through the opening;` and iivoted on saidsupport, a compression spring edending above and parallel to the valvesont, a .lug on the valve engaging one end of the spring, and anadjustable lever engi'agirig the opposite end of the spring.

Ll. In :i xarlinreler, the combination oi" sil body haring an air niiet,a pivot sniiport extending downwa :lly at one side of the opening, valveno Vnallji; clfsing ysaidopeiiing. and having an armextending downthrough the opening, a pivot for the iii'in Support., a eounterbulan'cii106 pivot, a lug on the upper spring.

5. i1 a carbureter, the combination of a chamber having an Iair inlet, apivot support extending downwardlyat one side ot' the opening, a valvenormally closing said openin and having an arm extending down v througithe opening, a pivot for the arm Cil mounted on the support,-a leverpivotally mounted adjacent the valve, a spring having one end inengagement with the lever and the other in engageinentwitli the valve, apointed screw in engagement with the lever for determining the initialtension of the spring, and means for locking the screw in a givenposition of adjustment.

(i. In a carburetor, the combination of a chamber having an air inlet, apivotally mounted valve normally closing the inlet, a pivotally mountedlever adjacent the valve, a spring having one end in engagement with thelever and the other end in engagement with the valve, means tending tomovethe lever in a direction such that, if unrestricted, it would tendto tension the spring, and adjustable means for limiting the amount otsaid movement.

7. In a carburetor, the combination of 'a chamber having an air inlet,afpivotally mounted valve normally closing the inlet. a pivotallymeunted lever adjacent the valve` a spring having one end in engagementwith the lever and the other end in engagement with the valve, a secondspring tending to swing the lever in a direction such that. itunrestricted, it would tend to tension the first Spring, andadjustablemeans for limiting the amount of Said movement'.

S. Tn a carburetor. the combination ot' 'a clianiliered body -havineran' air inlet', a `iivotally mounted valve normally closingl tile inlet, pivot supporting plates integral with the body, a lever pivotedbetween said plates, means'connecting the lever with the valve, and aplate for closing the space between the pivot supporting plates.

S). In a carburetor, the combination oft a body having an air inlet, avalve normally closing the air inlet, a pivot tor said valve adjacentthe inlet and below the plane ot' the. valve, a compression springextending above and. parallel lo the valve seat and Sobelair tially eual distances on each side, ot' Ieaid pivot, a .ug oi the valve engagedby one end ot the'spi'lng, and adjustable means engag-v ing the oppositeend of the spring.

10. In a earbureter, the combination of a chamber having an air inlet,apivotally mounted valve normally closing the inlet, a'

pivotally mounted lever adjacent the valve, a spring having oneend inengagement with the ,lever and the other end in engagement.

with the valve and tending to move the leve`r in one direction, a secondspring engaging with the lever and tending to move it in the samedirection, and adjust-able means,

for limiting thev amount of movement that inay be given to the lever.

ll. In a-carbureter. the combination of a chamber having an air inlet, apivotally mounted valve normally closing the inlet, a pivotally mounted.lever adjacent the valve, a spring having one end in engagement withthe lever and the other end in engagement with the valve, and tending tomove the lever in one direction, a second spring engaging with the leverand tending 'to move it in the same direction, anda screw for limitingthe amount lof movement that may be given to the lever. v

12.'In a carbureter, the combination of a carbureter chamber, a valvechamber connected thereto and having an air inlet, a

substantially. fiat valve normally closing said inlet, said valve havingattached thereto an outwardly and laterally extending arm, a pivot forsaid arm and valve mounted on the valve chamber, a projection on oneside of the valve, and a spring mounted at the same side of the valve asthe projection, said spring being arranged substantially parallel tothe. plane of the valve and having one of its ends inengagement withsaid projection to normally hold down the valve.

i3. In a carburetei', the combination of a carburetor chamber, a valvechamber connected thereto and having an air inlet, a valveseat aroundsaid inlet, a substantially tlat inwardly opening valve normally closingsaid inlet;` said valve having attached to the outer leide thereof anoutwardlv and latorally extending arm and to the inner side thereof aninwardly extending projection, a, pivot for said arm. and a springmounted on the same side of the valve aa the projection, said springlbeing arranged substantially parallel to the plane of the valve and hav'ing one ot its ends in engagement. with said projection to normally holdthe valve upon the seat.

ln testimony whereof I have Signed this .speelieation in the presence oftwo subscribing witnesses.

v CHESTER F. JOHNSON iV il nesetes z lliuzo lV. KaniNnniNo, l). M.SPENCER

